Code is used for performing more complex operations, compared to those that can be performed by the Equation, including communicating and retrieving data from external servers.

The Code endpoint provides a RESTful interface to interact with Code objects in the database. It allows authenticated users to create, update, and delete their own Code objects.

The base URL for the Code endpoint is https://datamanagerapi.solver-ai.com/api/data/code/.

• GET code: Retrieves a list of all Code objects associated with the authenticated user.
• POST code: Creates a new Code object associated with the authenticated user.
• GET code/{id}: Retrieves the Code object with the specified id.
• PUT code/{id}: Updates the Code object with the specified id.
• PATCH code/{id}: Updates part of a Code object with the specified id.
• DELETE code/{id}: Deletes the Code object with the specified id.

A Code can be set up via the Browsable API (2 - Module Management) or programmatically (more on this here).

The parameters required for creating a Code module via the Code Browsable API are:

• Name: Unique name identifying the Code.
• Code: Path to the python file.
• VariablesStringIn: Is the list of the input variables.
• VariablesStringOut: Is the list of the output variables.
• VectorizationIndices (optional): Indices used for vectorizing the Code.

Following is an example:

Name: Example Code
Code: C:/test/code.py
VariablesStringIn: x, y
VariablesStringOut: z
VectorizationIndices: 3-5

More on VectorizationIndices

The VectorizationIndices work similarly to the Equation and all the other modules.

In this example, VariablesStringIn represents the input variables to the code, which are 'x' and 'y'. The VariablesStringOut represents the output variables of the code, which for this case is only 'z'. The VectorizationIndices field is set to '3-5', indicating that this code should be vectorized over the indices 3, 4, and 5. This would be equivalent to defining three separate codes: 'code_3', 'code_4', and 'code_5'; where:

• for code_3 the inputs are x_3 and y_3, and the output z_3
• for code_4 the inputs are x_4 and y_4, and the output z_4
• for code_5 the inputs are x_5 and y_5, and the output z_5

If vectorizationIndices is left empty, then the code will not be vectorized and the naming of the variables will remain as defined by the VariablesStringIn and VariablesStringOut.

The code file frovided by you will contain a Python script. Things you should know:

• The version of python supported is 3.9.
• The code is run in a restriced environment and for security reasons you will not be able to use the “import” keyword to import libraries and modules.
• You can use numpy within your code as np (e.g., np.cos(x))
• You can use functions:
  • post: POST HTTP request
  • get: GET HTTP request
  • dumps: converts a python object to a JSON string
  • loads: converts a JSON string into a python object

The code file contains a Python script that uses the variables specified in VariablesStringIn as global variables and sets a value for one or more output variables specified in VariablesStringOut. For example, if we have VariablesStringIn as ‘x, y’ and VariablesStringOut as ‘z’, a possible Python script could be:

Code Example

if x > y:
    z = x
else:
    z = y

This script checks if ‘x’ is greater than ‘y’, and if so, sets ‘z’ to the value of ‘x’. Otherwise, it sets ‘z’ to the value of ‘y’.

Multiple Outputs Code Example:

If there are multiple output variables in variablesStringOut, you can set values for all of them in your Python script. For example:

if x > y:
    z = x
    w = x + y
else:
    z = y
    w = x - y

This script sets values for both ‘z’ and ‘w’ based on the comparison between ‘x’ and ‘y’.

GET HTML Request Code Example:

response = get(
    'https://server-url',
    headers={"Content-Type": "application/json"}
)
if response.status_code == 200:
    response_data = response.json()
    z = response_data.get('z') + x + y
else:
    z = 0

This script computes 'z' performing an HTTP request with a get function and adding 'x' and 'y' to it.

POST HTML Request Code Example:

data = {
  'x': x,
  'y': y,
  'userId': 1,
}
response = post(
    'https://server-url',
    data=dumps(data),
    headers={"Content-Type": "application/json"}
)
if response.status_code == 200:
    response_data = response.json()
    z = response_data.get('z')
else:
    z = 0

This script computes 'z' performing an HTTP request with a post function passing 'x' and 'y' as input data.

The code is executed in a restricted environment for security reasons.

Following is a list of python keywords and functions which will not be allowed, causing the code to fail:

Only authenticated users can interact with this endpoint, this can be done via the API page or pragrammatically via a token, which can be obtained from the Account page.

All Code created will be associated with the authenticated user, and and will not be accessible by other users.

• If you attempt to delete a Code that is used in a problem, the request will be denied with a 403 Forbidden status code.
• For information on doing the same programmatically follow the documentation relative to the API Clients.